Printhead Replacement Good Printing Effect Strict Quality Control High Resolution Single Black Printheads for MX722 Item Type: Printhead Replacement Material: ABS Model: QY6-0086 Color: Black and Yellow Function: For Printer Print Head Compatible Models: For iX6840 series, for Pixma MX720, for MX721, for MX722, for MX725, for Pixma MX920, for MX924, for MX926, for MX927 Abnormal solutions: The problem with error code 5100 and B200 is caused by the ink truck being stuck or the ink truck not being reset in time. Solution 1. Remove the ink cartridge and reinstall it, and then restart the computer and printer. 2. If this fault occurs frequently, check the ink supply line, or add lubricating oil to the trolley slide bar. 3. Manually reset the ink trolley ① Open the cover ② Push the ink cartridge to the right ③ Turn off the cover ④ Turn off the power ⑤ Turn on the power ⑥ Turn on the cover ⑦ Observe whether the ink cartridge automatically slides to the right ⑧ Use your hand to slightly increase the force to the right again while the ink cartridge slides ⑨ Feel that the ink cartridge has reached its full limit ⑩ Close the cover and complete the operation.